package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 分页查询菜品
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult PageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page =dishMapper.PageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 新增菜品
     * @param dishDTO
     */
    @Override
    public void addDish(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //将菜品信息保存到菜品表
        dishMapper.insert(dish);
        //获取生成的主键值
        Long id = dish.getId();
        //将菜品口味信息保存到菜品口味表
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(flavor -> flavor.setDishId(id));
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 启用禁用菜品
     * @param status
     * @param id
     */
    @Override
    public void updateStatus(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 修改菜品
     * @param dishDTO
     */
    @Override
    public void updateDish(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //将菜品信息保存到菜品表
        dishMapper.update(dish);
        Long id = dish.getId();
        //删除菜品口味信息
        dishFlavorMapper.deleteByDishId(id);
        //将菜品口味信息保存到菜品口味表
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(flavor -> flavor.setDishId(id));
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 删除菜品
     * 要求：
     *      1.起售的菜品不能删除
     *      2.与套餐关联的菜品不能删除
     *      3.删除菜品时，同时删除菜品口味信息
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断菜品能否删除--是否为起售状态
        for (Long id : ids) {
           Dish dish= dishMapper.getById(id);
           if(dish.getStatus() == StatusConstant.ENABLE){
               throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
           }
        }
        //判断菜品能否删除--判断菜品是否与套餐关联

        List<Long> list=setmealDishMapper.getIdByDishId(ids);
        if(list != null && list.size() > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品(for循环的方式：如果菜品数量较多，效率较低，建议使用批量删除)
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品口味信息
            dishFlavorMapper.deleteByDishId(id);
        }*/
        dishMapper.deleteByIds(ids);
        //删除菜品口味信息
        dishFlavorMapper.deleteByDishIds(ids);
    }

    @Override
    public DishVO getByIDWithFlavor(Long id) {
        //根据id查询菜品信息
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味信息
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 根据菜品分类id查询菜品信息
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> getByCategoryId(Long categoryId) {
        List<Dish> list=dishMapper.getByCategoryId(categoryId);
        return list;
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
